Tuesday, September 13, 2022
当泵输送液体()较高时,易产生汽蚀现象。A、流速B、流量C、温度D、以上都不是...
Monday, January 22, 2024
实际物体的辐射力与同温度下绝对黑体的辐射力前者大于后者。...
Friday, December 15, 2023
Tuesday, April 11, 2023
被测物体水平的实际偏差值H=水平仪气泡偏离格数×水平仪格值×被测物体长度,当H为定值时,被测物体较短时,气泡偏离格数越少。...
Tuesday, April 11, 2023
管子外壁加装助片(俗称散热片),目的是使热阻增加,传热量减少。...
Wednesday, August 2, 2023
Thursday, January 18, 2024
Wednesday, February 22, 2023
Thursday, August 10, 2023
活塞式压缩机常设有旁通调节,该调节能()。A、平衡气量B、减少耗功C、提高压力D、降低温度...
Wednesday, January 10, 2024
Friday, December 15, 2023
凝结水泵的出口水压是在负压条件下,因而要求具有良好的密封性能和抗汽蚀性能。...
Wednesday, April 12, 2023
Friday, November 17, 2023
Saturday, November 25, 2023
Sunday, April 7, 2024
Sunday, December 3, 2023
往复泵适用于()。A、大流量且流量要求特别均匀的场合B、介质腐蚀性特别强的场合C、流量较小,扬程较高的场合D、投资较小的场合...
Sunday, June 25, 2023
Wednesday, December 6, 2023
Thursday, January 18, 2024
Monday, June 19, 2023